Doctor's say a single concussion could dramatically raise a person's risk of developing Parkinson's. Bret Favre estimates he had "thousands" of them

Doctor’s say a single concussion could dramatically raise a person’s risk of developing Parkinson’s. Bret Favre estimates he had “thousands” of them

NBC News |
Hall of Fame quarterback Brett Favre’s announcement that he has Parkinson’s disease is bringing renewed attention to the potential links between ...